<section class='example-view' ng-init='initMethod()'>

    <!-- 控制按钮 -->
    <span ng-click='goback()' class='goBack'>返回</span>
    <span ng-click='loadExample("tree-radial")' class='codeview'>源码</span>

    <!-- 画布 -->
    <svg id='palette'>
        <g id='paletteLine'></g>
        <g id='paletteCircle'></g>
        <g id='paletteText'></g>
    </svg>

</section>